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Full Discussion: encountered a command line argument to c program puzzle!
Top Forums UNIX for Dummies Questions & Answers encountered a command line argument to c program puzzle! Post 302564787 by hackmanbsg on Friday 14th of October 2011 03:24:53 PM
Old 10-14-2011
encountered a command line argument to c program puzzle!
Hi,
I hope this is the right place to post this:
I have a cprogram written in openCV which reads a video file and does some processing: Here's a relevant code snippet:
Code:
//just in case you needed to know what libraries I included
#include<iostream>
#include<opencv/cv.h>
#include<opencv/highgui.h>
#include<dirent.h>
#include<string>
#include<cstdlib>
#include<cstdio>
#define SPACE_BAR 32
#define ENTER_KEY 10

using namespace std;
int main(int argc,char *argv[]){
        char title[]="ImageClipper";
        char title2[]="Cropped Image";
        if(argc!=2 && (cout<<"Usage: ./imageclipper <avi-path>"<<endl))exit(0);

        char *avifile=argv[1];
        cout<<"avi file is "<<avifile<<endl;

        CvCapture *capture=NULL;
 CvCapture *capture=NULL;
        capture=cvCreateFileCapture(avifile);
        if(capture==NULL){
          cout<<"capture is Null..exiting"<<endl;
          exit(1);
        }

// code to open some windows providing an interface to select sub regions of a frame...but the above lines should be sufficient
...
}

The problem faced:
When I run

Code:
./a.out path/to/video.avi

It works perfectly.

but when I run the following in a shell script(after creation of the txt file offline):
Code:
find path_to_folder_containing_avis -name "*.avi" > to_process.txt

for f in `cat to_process.txt`
do
./a.out $f
done

I get my error message "Capture is Null..exiting"(after the c++ program printed the right name). Any ideas why it's getting messed up?
 

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LEARN ABOUT DEBIAN

tree-puzzle

TREE-PUZZLE(1)						      General Commands Manual						    TREE-PUZZLE(1)

NAME

       tree-puzzle - Reconstruction of phylogenetic trees by maximum likelihood

SYNOPSIS

       tree-puzzle

DESCRIPTION

       This manual page documents briefly the tree-puzzle command.  This manual page was written for the Debian GNU/Linux distribution because the
       original program does not have a manual page.

       TREE-PUZZLE is the new name for the program previously known as PUZZLE!

       tree-puzzle is an interactive console program that implements a fast tree search algorithm, quartet puzzling, that allows analysis of large
       data  sets  and automatically assigns estimations of support to each internal branch. TREE-PUZZLE also computes pairwise maximum likelihood
       distances as well as branch lengths for user specified trees. Branch lengths can also be calculated under the  clock-assumption.  In  addi-
       tion, TREE-PUZZLE offers a novel method, likelihood mapping, to investigate the support of a hypothesized internal branch without computing
       an overall tree and to visualize the phylogenetic content of a sequence alignment.

       There is also a paralellized version tree-ppuzzle available.

OPTIONS

       There are no options. For usage please look at /usr/share/doc/tree-puzzle/tree-puzzle.pdf.

SEE ALSO

       phylip(1), treetool(1).	tree-ppuzzle(1).

       This manual page was written by Dr. Guenter Bechly <gbechly@debian.org>, for the Debian GNU/Linux system (but may be used by others).

								  April 20, 2001						    TREE-PUZZLE(1)
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